Electric motor



June-23, 1936. v. E. CARLSON ELECTRIC MOTQR Filed Aug. 20, 1932 INVENTOR Vrn onE.' 621176012 14 BY/yygs. www

ATTO RNEY Paienied June 23, 193e PATENT OFFICE n ELEc'rmc Moron Vernon E. Carlson, Canton, Ohio, assignmto The orth Canton, Ohio, a cor- Hoover Company, poration of Ohio Application August zo, 1932, serai N. sas,

4 claims. (ci. 111-324) 'Ihe present invention relates to electric motors and generators and more particularly to mounting means for the commutator brushes used in such machines. Itis a primaryobject of the present invention to provide a brush holder whichis so constructed that the current-carrying brush iseasily positioned therein and removed therefrom. It is a further object to provide a brush mounting embodying a new 'and novel means of retaining the brush spring in position within the brush holder which will permit its easy removal and insure its'e'ase of insertion. It is a. still further object to providean electric motor brush mounting in which certain parts are made of resilient material which' is deformable to permit their insertion in or removal from the mounting construction. Other and 'more specic objects will appear upon reading the following specification and claims, and upon considering the accompahying drawing.

In the drawing, in which like reference characters refer to like parts in the various views, and which discloses preferred embodiments of the -present invention:

Referring again to the drawing the presenti invention isshown embodied in an electric motor, the amature and commtator of which are indica'ted generally by the reference characters I and 2 respectively. 'Ihe armature shaft 3 is rotatably-mounted upon bearings l and 5 carried in the stator frame 6. 'I'he eld 'I is carried by the frame 6 which is itself enclosed by the outer ycri-sing 8.

As in the usual motor or generator of the direct current type, current-carrying brushes are provided to conduct the current to the commutator 2 and so to the armature I'. In Figure 1 the brush` 0 is shown in contact with the commutator 2. 'I'he stator frame E is provided with a seat I0 which houses the mounting for thebrush, which mounting comprises a metallic holderor socket Il, the'inner end of which is reduced in size so Figure 1 is a side elevation, partly.; "in section,

liomembei" Il isbellevedto as to s'lidlngly enclose the brush l. and the outer-V enlarged end portion of which is enclosed by an insulating sleeve I2 which is itself secured and clamped in seat Il by means of ascrew I3.

The inner end of metallic holder I I is connected to the current-carrylnglead Il and through the holder the current enters the brush 9 and so passes to the commutator 2. 'I'he outer end of the holder is provided with a transverse wall in which isbositioned an opening As shown in Figures 1 and 3 this opening is closed bya removable cap IS made of a resilient material such as rubber and which is provided with a reducedcentrai portion I I having a size substantially equal to -the seat I5 'Ihat part of tion I'I is size that it can be inserted through opening I5 by cap I 6 immediately forward of pordistortion. Adjacent this-enlargement the 'capis formed with an integral reduced projection which functions as a. spring seat. The main body of cap Ii mension overlying both the metallic holder II and the ber sleeve I2 so that it may be grasped and manually removed with but little trouble. It is believed that the manner of insertion and removal of cap rIB in seat Ii is obvious from the disclosure. With cap IS in place it forms an outer wall against which the spring I8, carried by the outer head of brush 9. seats and when in place the brush mounting-is complete and the brush is urged against the commutator by 'the spring.

Referring now to .Figure 4, in particulana second preferred embodiment oi' the invention is disclosed in whieh'the construction is substantially the same as that beforesdescribed. 'I'he metallic holder II is again enclosed byfaA ber sleeve I2 which is seated within the seat I0 of the' stator frame 8. In the present instance, however, the outer end of the holder II is provided with an outwardly extending flange or rim instead'oi' a wall provided with a bore in the rst embodiment. Thecap I6 ofthe first embodiment 'has been replaced by a. cap I 9 which is provided with an inner circular groove 20 which is adapted to enclose and overlie the flange upon member I I and to secure the cap 2l to that meinber when in plaoe. Because of the deformable character of the material forming cap I9 the positioning and removalof that member relative be obvious. Cap I9 is also provided with Vii. central bore 2| within which isseatgda, i splltmetallicl'membern the einer hanged edge which is adapted to seat'therein..

transversely enlarged but is of suchis slightly larger in its transverse di of-whicnis seated within Ni' Y ua second annular groove 23 in body i9.

Y 'Member 22 extends rearwardly through body id and receives the current-carrying lead 2li which may be secured thereto fin any suitable manner as by soldering. With cap i@ in place relative to the remainder' of the brush mounting with the outer flange o member it seated within groove 20, the spring i8 of brush 9 seats Within the metallic cap 22 and the construction functions in the same manner as the rst described embodiment.

I claim: i A

l. A mounting for a commutator brush cornprising a frame having a seat, a metallic socket carried by said seat and insulated therefrom,.said socket having a transversely extending flange, a cap of resilient insulating material shaped to seat against, cover andprotect the end of said socket and to enclose said dange and formed centrally with a spring seat, the relationship being such that it is nessary to manually deform said cap to position and remove itfon and from said socket, a current-carrying brush slidably carried in said socket, and a resilient spring seating on said cap and extended between said cap V'and said brush and urging said brush. longitudinally of said socket.

2. A mounting for a commutator brush comprising a frame having a seat, a metallic socket having a reduced open end carried by said seat, a circular inner flange on said socket at a point spaced from said reduced open end, a resilient cap having an encircling circuar groove adapted to seat said flange, the portion of said cap forward of said groove being insertable in said socket past said flange by manual deformation and being provided with a spring seat'which does not interfere with said deformation, a current-carrying crushA slidable in said socket, and a resilient accesos spring between said cap andsaid brush urging said brush thru said open end.

3. A mounting for a commutator brush comprising a frame having a seat, a metallic socket having an open end carried by said seat, a circu- 5 lar outer ange on said socket, a counterbored resilient can, a metallic cap seated in said rcsilient cap and extended centrally therethrll at one side, a current-carryinglead connected to the extended end of said metallic cap, a groove l0 in said resilient cap forward of said metallic cap vadapted to seat said flange, the portion of said resilient cap forward of said groove being deiormable to permit the seatingor unseating oi said iiange yin said groove, a current-carrying l5 brush slidable in said socket; and a resilient current-carrying spring between said metallic cap and said brush urging said brush thru the open end oi' said socket.

Il. 'in combination in abrush mounting, a brush 20 socket having an inwardly extending wall member at one end; a closure cap vfor a motor brush mounting comprising a body of resilient insulating material, an enlarged head portion at one end adapted to contact and overlie the boundaries of 25 said socket, an encircling channel on said cap immediately adjacent said head portion adapted to seat said `wall member, the portion of said can forward of said channel being manually deformable to permit its entrance into said socket past 30 said wall member, and a forwardly extending portion oi' reduced size forward of said channel adapted to be encircled by a brush spring and to serve as a seat therefor; a brush in said socket; and a spring seating on said cap and urging said 35 crush from said socket.

VERNON E. memoir 

